You may find this an interesting read
https://www.hrcr.co....r-to-rally-car/
Covers the basics but from my knowledge;
A spill kit
first aid kit
Warning triangle
Battery securely mounted and yellow earth lead
Seats must be solidly mounted
It’s things like is everything strapped down. The car will be thrown and bounced around so the last thing you need is things flying around
I have my spare wheel turned upside down with my tool bag in it then a ratchet strap from the corner by the petrol tank all the way to just in front of the battery. Using the smallest exhaust “u” clamps I could get drilled and bolted to the boot floor.
I also have a ratchet gun strapped to my front seat with a wheel nut socket on ready. The scissor jack I have is modified by welding a 1/2 socket to it for quickness
Make sure the distributor is protected. Mine has some pond liner riveted to the inside of the grille to stop the dizzy getting soaked. I also run with 2 coils , one in use and the other mounted close so in case of failure the wires can be swapped quickly and back on the road
Spares to carry
Spare bulbs (even if you check the lights before you leave they can fail before scrutineering)
Spare fuses, some electrical wire and connectors (I keep them in a pencil case in the door pocket
Bag of cable ties (hundreds of get you out of trouble uses)
5ltrs of oil and water(just my choice as it’s a long day)
Bottle of bars leak (in case of engine water leaks but only used in desperation)
Good selection of tools , screwdrivers , spanner’s ,pliers, a hammer etc
Oh and gloves( nothing worse than getting back in your car after making a repair and you have oil and dirt all over your steering wheel etc)
Think that’s it for now apart from the navigators array of things